In some cases, it will be necessary to establish the market value of land or a building or the fair rental rate of land or of space in a building. In these cases, the awarding agency must require that the market value or fair rental rate be set by an independent appraiser (or by a representative of the U.S. General Services Administration, if available) and that the value or rate be certified by a responsible official of the party to which the property or its use is donated. This requirement must also be imposed by the recipient on subgrants.